noggit: add object transform sensitivity modifiers

[ihm-tswow]

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Feature

Allows lower sensitivity when moving/rotating/scaling objects with mouse, makes it far easier to connect things like fences

Usage

Press k/l keys in object mode to change transformation sensitivity, ~4 stages

Notes

• Setting is not applicable for "Mouse follow cursor on the ground".

To do

• Try it out, check some sensitivity settings. I think 0.05 as a lowest allows me to do everything i'd want, but maybe there's some use-case i'm not considering. I see no reason to allow it to go above 1.0

• Are these good hotkeys to use? I put them close to O/P since that's close to the buttons used for camera sensitivity

• Tablet test?