Makes More Objects Climbable

[SleepyGemmy]

this PR makes gas canisters and closets climbable.

changes

• makes gas canisters climbable.
• makes closets and lockers climbable, excluding wall mounted ones.
• adds a climb_time variable to objects so each object can have its own required time to climb it.
• makes all /obj climbable, if the variable is set to TRUE.
• adds a dedicated shakable variable to objects, for things that can't be shaken, like anchored or heavy structures/machinery.

[SleepyGemmy]

!review

[SleepyGemmy]

closing for now.

[SleepyGemmy]

not pursuing this.