Enable (and fix) basic warnings on all platforms

I affirm:

[x] that I agree to Project Topaz's Limited Contributor License Agreement, as written on this date
[x] that I've tested my code since the last commit in the PR, and will test after any later commits

Clang:

-Wlogical-not-parentheses
Example: !PMob->getMobMod(MOBMOD_NO_DESPAWN) != 0

-Wenum-compare-switch
-Wabsolute-value
Using abs() on an unsigned value (negative isn't possible)

-Wtautological-constant-out-of-range-compare
Checking to see if a condition is true on a type where it isn't possible.  Example: is a uint8 larger than 10000?

-Wnon-virtual-dtor
-Wunused-lambda-capture
-Wmissing-field-initializers
-Wunused-private-field
-Wmissing-field-initializers

project-topaz / topaz

Enable (and fix) basic warnings on all platforms #1426