Add GM 1.3 assets

[Sparker95]

List of classes we can use, prepared by Christiansen:

EAST GERMANY

T_VEH_car_unarmed
ADD "gm_gc_army_uaz469_cargo"

T_VEH_car_armed
ADD "gm_gc_army_uaz469_dshkm"

T_VEH_stat_HMG_high
DELETE "gm_ge_army_mg3_aatripod"
ADD "gm_gc_army_dshkm_aatripod"

T_VEH_truck_inf
ADD "gm_gc_army_ural375d_cargo"

WEST GERMANY

T_VEH_MRAP_HMG
DELETE "gm_ge_army_iltis_mg3"
ADD "gm_ge_army_fuchsa0_command", "gm_ge_army_fuchsa0_engineer"

T_VEH_MRAP_GMG
DELETE "gm_ge_army_iltis_milan"
ADD "gm_ge_army_fuchsa0_reconnaissance"

T_VEH_IFV
DELETE "gm_ge_army_fuchsa0_reconnaissance", "gm_ge_army_fuchsa0_engineer", "gm_ge_army_fuchsa0_command"
ADD "gm_ge_army_marder1a1a", "gm_ge_army_marder1a1plus", "gm_ge_army_marder1a2"

GM_CIVILIAN

_civUniforms
ADD "gm_gc_civ_uniform_man_03_80_blu", "gm_gc_civ_uniform_man_03_80_grn", "gm_gc_civ_uniform_man_03_80_gry", "gm_gc_civ_uniform_man_04_80_blu", "gm_gc_civ_uniform_man_04_80_gry"

[Sparker95]

Done here:
#788