Miscellaneous fixes (#2774)

changes:

Fixed various GC failures.
Converted integrated radios (used in PDA cartridges) to Initialize.
Added a missing Destroy to the QM PDA cartridge's integrated radio.
Fixed a runtime when mineturfs with no ore were destroyed by explosions.
Fixed a runtime when explosions attempted to Z-travel.
Minor radio performance improvements.
Converted radio globals to defines.
Changed the Security-I and Medical-I frequencies to use the same colors as their respective departments.
Fixes #2646.

code/controllers/subsystems/garbage-debug.dm

@@ -366,9 +366,6 @@
 	SearchVar(panic_targets_data_loss)
 	SearchVar(Failsafe)
 	SearchVar(Master)
-	SearchVar(MC_restart_clear)
-	SearchVar(MC_restart_timeout)
-	SearchVar(MC_restart_count)
 	SearchVar(CURRENT_TICKLIMIT)
 	SearchVar(SSalarm)
 	SearchVar(SSchemistry)
@@ -658,8 +655,6 @@
 	SearchVar(uristrune_cache)
 	SearchVar(slot_flags_enumeration)
 	SearchVar(BUMP_TELEPORTERS)
-	SearchVar(splatter_cache)
-	SearchVar(fluidtrack_cache)
 	SearchVar(active_radio_jammers)
 	SearchVar(default_uplink_selection)
 	SearchVar(chatrooms)
@@ -680,9 +675,7 @@
 	SearchVar(stool_cache)
 	SearchVar(enterloopsanity)
 	SearchVar(flooring_types)
-	SearchVar(floor_decals)
 	SearchVar(random_junk)
-	SearchVar(flooring_cache)
 	SearchVar(js_byjax)
 	SearchVar(js_dropdowns)
 	SearchVar(BSACooldown)
@@ -705,7 +698,6 @@
 	SearchVar(admin_verbs_mod)
 	SearchVar(admin_verbs_dev)
 	SearchVar(admin_verbs_cciaa)
-	SearchVar(jobban_runonce)
 	SearchVar(jobban_keylist)
 	SearchVar(admin_datums)
 	SearchVar(CMinutes)
@@ -771,7 +763,6 @@
 	SearchVar(admin_verbs_lighting)
 	SearchVar(liquid_delay)
 	SearchVar(puddles)
-	SearchVar(maploader)
 	SearchVar(_preloader)
 	SearchVar(swapmaps_iconcache)
 	SearchVar(SWAPMAPS_SAV)
@@ -807,9 +798,6 @@
 	SearchVar(diona_banned_languages)
 	SearchVar(alcohol_clumsy)
 	SearchVar(sparring_attack_cache)
-	SearchVar(human_icon_cache)
-	SearchVar(tail_icon_cache)
-	SearchVar(light_overlay_cache)
 	SearchVar(damage_icon_parts)
 	SearchVar(MAXIMUM_MEME_POINTS)
 	SearchVar(host_brain)
@@ -822,7 +810,6 @@
 	SearchVar(pai_emotions)
 	SearchVar(robot_custom_icons)
 	SearchVar(robot_modules)
-	SearchVar(mob_hat_cache)
 	SearchVar(protected_objects)
 	SearchVar(SKILL_NONE)
 	SearchVar(SKILL_BASIC)
@@ -849,7 +836,6 @@
 	SearchVar(BLOOD_VOLUME_BAD)
 	SearchVar(BLOOD_VOLUME_SURVIVE)
 	SearchVar(organ_cache)
-	SearchVar(limb_icon_cache)
 	SearchVar(all_robolimbs)
 	SearchVar(chargen_robolimbs)
 	SearchVar(basic_robolimb)