Added a model for the tool.

- Added 'stage' feature:
Add, remove or cycle stages to make it easier to setup complicated explosive chains. Use 'X' to add a new stage, 'C' to cycle the selected stage and 'V' to remove the selected stage (default).
When detonating the bombs (using 'K' by default), stages detonate starting from stage 1 and adding/cycling stages is disabled. Removing a stage during detonation will also pause the detonation chain completely.
When adding a stage, it will use a delay equal to 10 times the selected bomb delay (so if your bomb dealy is 1, then the stage delay is 10). When one stage finishes detonating, the next one automatically starts UNLESS it's delay is 0,
in which case you'll need to start it manually. This way, you can have multiple explosive chains setup instead of just one.
You can't add a new stage if the previous one has no bombs in it.
Removing the last bomb in a stage will also remove the stage.

- Improved delay controls:
You can now hold shift when cycling the bomb/stage delay to cycle in the opposite direction (5 to 2, 2 to 1 ... 0 to 5).

- Improved bomb strength controls:
You can now hold shift when increasing/decreasing the bomb strength to do so 8 times faster.
You can now hold ctrl when increasing/decreasing the bomb strength to do so 16 times faster. (Won't work if you're already holding shift)

- Slightly lowered the UI to the bottom to make up for the slightly increased text height.

I probably won't do much else for this mod as I feel like it's in a decent spot right now.
The only thing I might do sometime later is making the bombs actual voxels instead of sprites, however this may need a significant rewrite of the mod to support this..
(And of course I'll be fixing bugs when they arise and listening to community feedback)

Assigned Upgraded C4 to slot 4

Small bug fix: Apparently I had accidentally set the default sprite level to 0, this has now been changed back to 3.

- Added new option to toggle between using global or own explosion size/delay. 'Global' will make the mod behave like the original C4 mod where each bomb has the same size and delay. 'Own' (Default) will make each bomb remember the size and delay active upon being placed.

- Added new option to toggle the sprite level:
Level 0 = invisible bombs (no sprites drawn)
Level 1 = Simple 2D bomb (1 sprite drawn per bomb)
Level 2 = Simple 3D bomb, no bomb info (6 sprites drawn per bomb)
Level 3 = Simple 3D bomb, bomb info shown (9 sprites drawn per bomb) (default)

Higher sprite levels create more lag, as more sprites need to be drawn for the visuals.
If the mod is lagging too much or you simple want to place a lot of bombs, consider lowering the sprite level.

Discovered that the original code's rebinding of the detonation key did not work, so I fixed that. Also added a key to remove the last placed bomb. No longer do you need to restart your entire destructive project just because you misplaced bomb number 200 something! Just press Z (default) to remove the last bomb in line.

Initial release. Bombs now remember their own delay and size, and have unique visuals to indicate their exact timer and estimated blast size.