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Remove unused variables after eb191c09cc96450a4e62c3592a5697b407f6bc36.
Remove some overzealous constifications to avoid C4510 and C4610 warnings.

The language resources array is const already so there is no risk of unwanted modification.
Fix some typos.
Add missing file in MPCTestAPI.vcxproj.filters.
Update Changelog.txt.
Be consistent with the var type.
Check return value when it make sense.

Fixes CID #965890, #965892, #965893, #965894, #965898, #1084351
Remove dead conditionals

Fixes CID #965943 #965949
Fix integer overflow

Fixes CID #966079, #966078
Fix uninitialized class members

Fixes CID #366317, #366318, #366360, #966281, #966282, #966283, #966284,
 #966285, #966286, #966287, #966310, #966311, #966313, #966314, #966316,
 #966328, #966329, #966343, #966345, #966346, #966347, #966349, #966350,
 #966354, #966358, #966359, #966361, #966362, #966363, #966364, #966365,
 #966366, #966370, #966371, #966373, #966374, #966375, #966376, #966377,
 #966378, #1026047, #1027114, #1041190
Cosmetics in CSyncAP, CBaseAP and CEVRAllocatorPresenter constructor for coverity
fixes and better readability.

Fixes CID #966315, #966319, #966320
Change RasterizerNfo to struct.

Initialize variables in constructor.

Fixes CID #966372
Remove default empty string from GetProfileString()
Cosmetic for GetProfileInt(), change int to BOOL when it makes sense.
Remove unused variables

Fixes CID #966363, #966530
Cosmetic for error check.
Reduce variable scope when possible

Remove unused variables

Spotted by cppcheck