fixed compilation errors in Linux
loftempsSet defined via armour
removed comments
revert Armor class constructor
Second attempt to fix gcc-4.4 errors

This time by renaming functions.
Merge remote branch 'upstream/master' into fixLinuxMouseWheel
moved installation to /usr
added a yaml-cpp restriction on version
Scrolling as smooth as a baby's bottom. You will have to reset your Scroll Speed option for this to take effect.
Make last two locations for data available even if XDG_DATA_DIRS is defined in system.
This can be required for non-standart datadir locations, defined at compiletime.
reverted description to the correct one
Merge pull request #472 from kalxas/master

Fixed installation directory and yaml-cpp version
Merge pull request #410 from AndO3131/fixLinuxMouseWheel

fixed compilation errors in Linux
step 1: modify buttons for new functionality.

add a boolean flag to ArrowButtons to keep track of the fact they're part
of a list, and a couple of functions to get and set them.

add a boolean flag to ImageButton to keep track of it's inverted state, and
functionality to make use of it.
step 2: dubious method for calling the previously added variable.

this is iffy, not sure if i like this.

on the plus side, it works.
step 3: cache the mouse handling setting.

we don't want to make a call to yaml_cpp every time the mouse does anything
cache it in the surface instead.
step 4: well there's your problem.

checking buttonsPressed(0) produces wacky results. let's not do that.
also, move some brackets around, and change the condition to mouse movement.
Step 5: adjust behaviour on applicable screens

omnomnom delicious copy pasta.

changes some existing behaviours to better accommodate new functionality.
step 6: realize i'm an idiot

that doesn't go there.
fix rookie mistake.