hotkey usability

resolve hotkey conflicts, fixes #2883
add/display existing in-game button hotkeys, fixes #2932
fixes #2938 unbreak make install and SharpFont on Mac
Merge pull request #2943 from Mailaender/make-install-sharpfont-fix

Unbreak make install and SharpFont on Mac
infantry speed increased from 90% to 100%.

During playtesting it seemed like having infantry go at full speed on clear terrain was a good addition.
If it seems inappropriate for some infantry, can change it individually later for some units that might be too fast (e.g. flamethrowers and grenadiers, who travel at speed=5).
mammoth turret rotation 2 -> 3, matching tank rot.

A good idea to make mammoth able to rotate to face air units it wants to hit, faster. 
APC gun does slightly more dmg; slower ROF

APC gun does 30 damage, so it can kill orca in 3 shots.
ROF lowered to compensate. 
orca, apache require ANYHQ instead of HQ

allows units unlocked by HQ to stay available as long as you have either advanced comm. center or temple of nod.
Merge pull request #2948 from psydev/patch-1

balance stick - infantry, mammoth
fixes #2946 non-standard FreeType DLL P/Invoke on Windows
don't render empty remaining tick bars for iron curtain / chrono
fixes #2947 don't perform keyboard orders on destroyed actors
Merge pull request #2955 from Mailaender/dead-actor-stances-fix

Don't perform keyboard orders on destroyed actors which crashes the game.
construction yard HP reduced 2000 -> 1500

Now that MCV is buildable again, the conyard doesn't need to be the ultra-heavy armored bunker it has been. Now a nuke can almost kill it. 
increased speed of TowerMissile; inc. burst delay

Increased speed of TowerMissile. At present it is very slow and not terribly effective vs. air units because they can quickly leave range before getting hit. Speed stats are same for E3 and RocketBike.
Burstdelay increased. This is to avoid wasted missiles on the same target that might get destroyed.
Rangelimit reduced from 40 to 30 to compensate for increased missile speed. 
orca ROF decreased. 10 -> 15

Orca missiles fire a bit slower, so that the unit cannot unload all its rockets in 2 seconds. Will give defenses a bit more time to respond before they die or before the orcas run away.
mcv odds w/o base 80%

-Odds of getting MCV in a crate w/o a conyard is 80%, so that people aren't tempted to sell their conyard at beginning.
-Changed Hard AI's limits of procs, barracks & factories, since AI has to work within the conyard's build radius and crowding is no good, because it prevents them from building all tech buildings.
AI no longer builds FIX

To save space within conyard's build radius, AI will not build FIX, since it doesn't know how to use it, and it provides no pre-requisites. 
Added two new maps.
fixed error in slippery_slopes.oramap
Merge pull request #2953 from Mailaender/freetype-windows-fix

Use the correct FreeType DLL file name on Windows