Cleanup debug border, add test button.

src/gui/control_bar.odin

@@ -3,6 +3,9 @@ package gui
 import m "../machine"
 import rl "vendor:raylib"
 
+CB_PADDING :: 20
+
 gui_control_bar :: proc(rect: rl.Rectangle, s: ^m.System) {
 	rl.DrawRectangleLinesEx(rect, 1, rl.DARKGRAY)
+	rl.GuiButton(rl.Rectangle{rect.x, rect.y, 100, rect.height}, "test")
 }

src/gui/right_panel.odin

@@ -4,5 +4,5 @@ import m "../machine"
 import rl "vendor:raylib"
 
 gui_right_panel :: proc(rect: rl.Rectangle, s: ^m.System) {
-	rl.DrawRectangleLinesEx(rect, 1, rl.GREEN)
+	rl.DrawRectangleLinesEx(rect, 1, rl.DARKGRAY)
 }