Update sockets module (#301)

* Module rewrite

- WinSock version changed from 1.1 to 2.2.
- Properly check for WinSock initialization on OnAmxxAttach/Detach.
- Now natives will not be added if we can't start up WinSock.
- socket_open() is now IP version agnostic (both IPv4 and IPv6 are
supported).
- Error reporting has been changed on socket_open(), a new parameter
called _libc_errors has been added, and, if enabled, libc errors will be
returned instead of the previous made-up errors.
- socket_close() now returns a value on success/failure.
- Added non-blocking sockets at socket_open_nb().
- Added socket_is_writable() to check if a socket is ready for write.
- Added socket_is_readable() as an alias to socket_change().
- Code rewritten to be more readable, it should be self-explaining now.

* Update docs and fix AMBuild

Updated documentation following the guidelines

* Fixs for the module

- Fixed the backwards compatibility with the return codes
- Merged socket_connect and socket_connect_nb
- Added a 5th parameter to socket_open that takes bit flags to enable
the new features (libc errors & nonblocking sockets)
- Fixed an error on socket_send2 that caused the buffet not to start
from the beginning if multiple calls were made
- Updated docs
- [docs] Prefixed error codes with SOCK_
- [docs] Added the new flags SOCK_NON_BLOCKING and SOCK_LIBC_ERRORS
- [docs] Added a new stock called SOCK_ERROR_EINPROGRESS(error) to be
used when checking if a newly created nonblocking socket is connecting

* Fixes for the docs

Fix some typos, shorten lines, document SOCK_ERROR_EINPROGRESS

* Document magic numbers

No more magic

* Revert "Document magic numbers"

This reverts commit 0f233292063400ea7fdbcd5e5d5cd6e54f8cd71c.

* More docs fixes

* Fix broken socket_send2()

* Add error checking in send2()

* Remove stock

It should not be needed because nb sockets should always be checked or
writability

* Fix some identations

* Fix return codes doc

* Fix socket_recv() regression

strncopy will stop on a null byte, that makes the function unusable to
receive binary data

* More docs typo fixes

modules/sockets/msvc12/sockets.vcxproj

@@ -55,7 +55,7 @@
     <ClCompile>
       <Optimization>Disabled</Optimization>
       <AdditionalIncludeDirectories>..\;..\..\..\public;..\..\..\public\sdk;..\..\..\public\amtl;..\..\third_party;..\..\third_party\hashing;$(METAMOD)\metamod;$(HLSDK)\common;$(HLSDK)\engine;$(HLSDK)\dlls;$(HLSDK)\pm_shared;$(HLSDK)\public;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;_USRDLL;SOCKETS_EXPORTS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>WIN32;HAVE_STDINT_H;_DEBUG;_WINDOWS;_USRDLL;SOCKETS_EXPORTS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <MinimalRebuild>true</MinimalRebuild>
       <BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
       <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
@@ -66,7 +66,7 @@
       <DebugInformationFormat>EditAndContinue</DebugInformationFormat>
     </ClCompile>
     <Link>
-      <AdditionalDependencies>wsock32.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <AdditionalDependencies>ws2_32.lib;%(AdditionalDependencies)</AdditionalDependencies>
       <GenerateDebugInformation>true</GenerateDebugInformation>
       <ProgramDatabaseFile>$(OutDir)sockets.pdb</ProgramDatabaseFile>
       <SubSystem>Windows</SubSystem>
@@ -79,7 +79,7 @@
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <ClCompile>
       <AdditionalIncludeDirectories>..\;..\..\..\public;..\..\..\public\sdk;..\..\..\public\amtl;..\..\third_party;..\..\third_party\hashing;$(METAMOD)\metamod;$(HLSDK)\common;$(HLSDK)\engine;$(HLSDK)\dlls;$(HLSDK)\pm_shared;$(HLSDK)\public;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;_USRDLL;SOCKETS_EXPORTS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>WIN32;HAVE_STDINT_H;NDEBUG;_WINDOWS;_USRDLL;SOCKETS_EXPORTS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
       <RuntimeTypeInfo>false</RuntimeTypeInfo>
       <PrecompiledHeader>
@@ -88,7 +88,7 @@
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
     </ClCompile>
     <Link>
-      <AdditionalDependencies>wsock32.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <AdditionalDependencies>ws2_32.lib;%(AdditionalDependencies)</AdditionalDependencies>
       <GenerateDebugInformation>true</GenerateDebugInformation>
       <SubSystem>Windows</SubSystem>
       <OptimizeReferences>true</OptimizeReferences>