adjust explosion positions with sequence offsets instead
MAKE: refactor Makefile

improved readability, moved tools at the top, rules at the bottom

make -> build core
make all -> build core and tools
install -> install core
install-all install core and tools
MAKE: revert DATA_INSTALL_DIR value for backwardscompat

otherwise build scripts will have to adjust
fix contrail offsets for the migs in fort lonestar

was using the badr ones before
added huge RA KotH map ATHENA

The map has been tested with four players and was reasonably lag free.
Note that this is the newer fixed after the multiplayer playtests - the
one on the content openra is outdated.

While the map is working perfectly fine, it would be great if
https://github.com/OpenRA/OpenRA/issues/3496 could be implemented. That
way, the player would have multiple starting options.
RA map ATHENA: added Allowbots false

see above // as mentioned in https://github.com/OpenRA/OpenRA/pull/3509
and
https://github.com/OpenRA/OpenRA/commit/e0ffc205b1954bff013e48f05ef6a7f33674173b
MAKE: simplify install rules

just copy all mod folders recursively, this also fixes
missing d2k/weapons and ra/sequences folders
Merge pull request #3498 from Mailaender/explosion-offsets

Remove redundant explosion bits and fix lonestar mig contrails
MAKE: install more missing files

this should fix crash when clicking on "credits"
and the asset browser
MAKE: quote all variables that can contain whitespace
Merge pull request #3500 from hasufell/Makefile

MAKE: refactor Makefile
Merge pull request #3497 from wuschel/bleed

added huge RA KotH map ATHENA
Force spectator color to white on join. Fixes #3501.
Disable pausing for spectators. Fixes #3340.
Merge pull request #3527 from pchote/spectator-color-fix

Spectator fixes
Merge pull request #3520 from ScottNZ/hosp

Make captured hospitals in cnc/ra gradually heal all infantry units on the map
Outsource civilian nudging from mission scripts to its own trait
Set up Allies 05. Refactor some mission stuff to new files.
Fix DescAttribute fail in CashTrickler.cs
Add basic attack routines to Allies 05