tastudio: make input keys do something outside rec mode

[vadosnaprimer]

taseditor has some logic, and FRK asked for some stuff in that regard:
http://tasvideos.org/forum/viewtopic.php?p=450129#450129

adelikat's idea: arrow keys to select an individual cell and space to toggle (for buttons)

[vadosnaprimer]

Basically, I would like to tap the related control binding to toggle it on the current frame.

[vadosnaprimer]

From Discord.

[1:50 AM] suqd: in TAStudio, is there a way to bind an input (for example, [Right]) to keyboard? so I don't have to click every time?
[1:56 AM] suqd: (only to the currently selected frame)

[warmCabin]

Would be really good if it could toggle everything in the selection, too. Basically do the same as when the button at the top of the column is clicked.

[vadosnaprimer]

When you have to do a lot of analog editing it'd help a lot to be able to do it all just with the keyboard for every individual cell, and selection cursor seems to be the best way to handle this without having to emulate the the frame you're editing and to enable rec mode.

Which ties back into selecting individual cells, maybe it'd make sense to use alt+arrows to select them?

Example. You use arrows to move selection up and down, and you can hold Shift to add selection instead of moving it. What if we use some modified combined with an arrow to switch from selecting full row to selecting just one cell? Like you'd select a row, then hold Alt and then Right or Left, first cell gets selected. Keep holding Alt and hit Right again, the next cell gets selected instead. And if you hit Alt+Up/Down then the corresponding cell is selected on the other frame.

Space for binary buttons sounds good. The initial idea was to just replicate taseditor behavior and use bound inputs to toggle corresponding keys on the selected frame, and that still sounds very useful, but when only 1 cell is selected I think space is a good universal way to toggle it.

And for analogs, we know that Space can't be a part of the numeric value so it might work as a way to actually enter the value you've typed. Tho what happens next is unclear: should you go to the next cell on the same row, or to the same cell on the next row?