Fix compiler warnings

[ETLegacyTeam]

Author: @IR4T4 (IR4T4)
Date: 2012-04-24
Redmine Issue: 33, https://dev.etlegacy.com/issues/33

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There are tons of warnings ... improve the code quality and fix them!

Note: ignore AI - see #3

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Related commit(s):
38c01ed - trivial warning fixes - refs 33
72c08ef - housecleaning of common.c - refs 33
d7a7290 - ugly warning fix for 64b - refs 33
9c8e3e8 - warning fix refs 33
7517b31 - bg_animation refs 33
f3442dd - cg_sound refs 33
a6e32cf - game fixed to use OB refs 33
86a0b2c - OB fix refs 33
47c4ffc - be_ea.h refs 33
55b1352 - botai path removed from project refs 33
4320d2c - botlib clean up refs 33
2dc8a0c - server: all warnings fixed, refs 33
72aeb86 - game code cleanup refs 31 - fixed warnings depend..
44124e4 - warning fix refs 33 . some formatting
b8b8e7c - generic: clang compilation and warning fixes, refs..
f7d8c33 - misc: ported ioquake3 'noreturn' warning fix, refs..
8537ebf - misc: fixed a few compiler warnings, refs 33
5d69b39 - misc: warning fixes, unsigned cannot be < 0, refs ..
5c03a71 - misc: compiler warning fixes, refs 33
940900b - cgame: fixed 'implicit declaration' warning, refs ..
bf3d69f - game: removed duplicate variables, refs 33
a3a428b - misc: fixed a couple of compiler warnings, refs 3..
6b88f75 - generic: compiler warning fixes, refs 33
e4278e5 - generic: fixed implicit declaration warnings, refs..
e52bda7 - generic: minor clean up and warning fixes, refs 3..
8a63c9c - server: comment formatting and removed one forgott..
7061fcf - mod: no need to use va() in G_LogPrintf, clean up,..
856b228 - client: resolve ET:L update server, refs 32, refs..
1db996a - misc: fixed several 'set but not used' warnings, r..

[ETLegacyTeam]

From: @JanSimek (Radegast)
Date: 2012-07-12T10:22:58Z

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Last two gcc warnings left!

[ETLegacyTeam]

From: @IR4T4 (IR4T4)
Date: 2013-02-05T16:11:23Z

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Closed. See also #193