Remove outdated gear functions, insert of new get/set-loadout ones

[Casperento]

Resolves # (Not reported directly on Issues tab, but appellant, since new 2.02 arma version)

Changes proposed in this pull request:

• Remove outdated functions: fn_loadDeadGear.sqf and fn_fetchDeadGear.sqf

• Code refact. for life_save_gear

• [x] I have tested my changes and corrected any errors found