Disable micro auto formatting bindings.json when adding new bindings

[Neko-Box-Coder]

Description of the problem or steps to reproduce

micro keeps auto formatting bindings.json, when there's a new binding needs to be added to the json (either from user or plugin). Resulting it removing all the comments and reordering everything. Making it difficult to keep track of modified keys.

Specifications

Commit hash: 9176508
OS: Linux
Terminal: WezTerm

[Neko-Box-Coder]

So this happens when whatever is trying to bind/unbind a key, whether it is from the user or a plugin.
The same goes for settings. I guess it's alright it is coming from the user (using bind) but not quite so if it is from the plugin.

Having my keybindings/settings formatting and comments get removed completely is quite annoying and discouraging.

I think we should just do a string append ourselves instead. This should be relatively achievable.
So here are the places where the jsons get write to so that I or someone can come back to later:

micro/internal/config/settings.go

Lines 293 to 294 in 9176508

	txt, _ := json.MarshalIndent(parsedSettings, "", " ")
	err = ioutil.WriteFile(filename, append(txt, '\n'), 0644)

micro/internal/config/settings.go

Lines 315 to 316 in 9176508

	txt, _ := json.MarshalIndent(settings, "", " ")
	err = ioutil.WriteFile(filename, append(txt, '\n'), 0644)

micro/internal/action/bindings.go

Line 376 in 9176508

"MouseLeft": tcell.ButtonPrimary,

micro/internal/action/bindings.go

Lines 319 to 320 in 9176508

	txt, _ := json.MarshalIndent(parsed, "", " ")
	return true, ioutil.WriteFile(filename, append(txt, '\n'), 0644)