Slight cleanup to pull click actions into own fns

[GavinRay97]

Just makes it so that the core code of main() is the barebones logic and the details are hidden behind functions that have names describing their conditions

function main()
    reaper.Undo_BeginBlock()
    window, segment, details = reaper.BR_GetMouseCursorContext()
    patternClipHover = hovering_over_pattern()

    -- If the user is hovering over a pattern clip
    if segment == "track" and patternClipHover then
        handle_pattern_left_click()
    elseif window == "unknown" then
        handle_unknown_window_click()
    elseif reaper.JS_Mouse_GetState(1) == 0 and patternLeftClick then
        handle_release_pattern_left_drag()
    elseif reaper.JS_Mouse_GetState(-1) >= 4 then
        -- if the user drags onto the tcp
        reaper.JS_WindowMessage_ReleaseAll()
    elseif window == "tcp" then
        handle_drag_to_tcp()
    elseif segment == "track" then
        handle_cursor_on_track()
    elseif segment ~= "track" then
        reaper.JS_WindowMessage_ReleaseAll()
    end

    -----------------------------------
    --[			Defer Mngmt			 ]--
    -----------------------------------
    if reaper.JS_VKeys_GetState(-1):byte(27) == 1 then
        reaper.atexit(on_exit)
        return
    else
        reaper.defer(main)
    end
end

[GavinRay97]

Also sorry about the sloppy Git diff -- most of it is just useless formatting changes from IDE's auto-format-on-save feature

Actual content changes are basically just this:
https://github.com/GavinRay97/lemerchand/blob/patch-1/SERA/SERA%20-%20Draw%20Tool.lua#L222-L446