Ninja bugfixes/minor code cleaning/energy cost changes

The changes in energy cost may not fall under the umbrella of bugfixes, tell me if I need to have a forum referendum or something.

Stuff changed:
Phase shift now actually costs energy to perform (400)
-Minor grammar correction
-EM Burst now costs 2000E, up from the listed cost of 1000E and down from the actual cost of 2500E.
-Energy blade's listed energy cost now correctly reflects the actual activation cost (500E)
-Energy Star now costs 800E, down from the listed cost of 1000E and actual cost of 5000E, up from the intended (maybe?) cost of 100E.
-Energy net now correctly holds the target in place (fixes #4152). Also costs 7000, down from listed cost of 8000 and what was apparently an actual cost of 50000 which never actually got taken from the battery for some reason
-Changed all values of X other than 1, 2, and 3 for ninjacost in ninja_abilities.dm to 0
-Altered certain cell.use procs in ninja_abilities.dm to multiply C by 10 instead of 100 for consistency
-Added "captured" variable, makes mob stand, unable to move, and anchored.

Edit: I didn't actually make admin-spawned ninja start with an oxygen tank; think some of Zuhayr's earlier changes fixed this.