Sourcepawn new syntax

[TheChineese]

Updated to use sourcemod's new syntax (introduced by version 1.7). Especially new type for ConVars (ConVar). So that the ConVar Methodmap can be used (i.e. g_cTest.GetString(buffer, 4)).

[Impact123]

There are a few things missing like using null instead of INVALID_HANDLE and using the methodmap syntax to close handles of files, but other than that it looks good. Thanks!
The reason i haven't done this before is because i wanted to support users who, for whatever reason, still use an old compiler. I've used the view_as operator in CallAdmin to be able to use methodmaps, but now that i think about it, there's no reason to not update the syntax.

[TheChineese]

Changed the mentioned points. Did I forgot something?

[ghost]

btw. you can use #pragma newdecls required for testing.

[Impact123]

This looks good, thanks for the effort! I appreciate it.

[TheChineese]

@bara20 Did that, but there was no error while using the old syntax for the file handling nor for the decleration of INVALID_HANDLE.