Fix path to generated files

These files were not included in the project:

plugin/plugin.rc
plugin/plugversion.h
Don't include commit number in version_rc
Make Profile ctor responsible for disabling SYSREQ.D
Drop AmxUnload() fix code

When sent a Ctrl+C to the server on Windows it didn't call AmxUnload()
for loaded AMX scripts during the shut down. But apparently this has
been fixed, so this code isn't needed anymore.
Change "output format" to "profile format"
Drop support for the "profiler_enabled" variable

Public variables are somewhat bugged in Pawn and rarely used.
It is not enough to just declare the variable, but you also
have to use it somewhere, because otherwise the compiler will
omit it from the resulting .amx file.