Adds process_mode property to PTY which can be set to IDLE or PHYSICS.
Determines whether the PTY will be updated in the `_process()` or
`_physics_process()` step. Defaults to PHYSICS.
Prevents scrollback buffer reset (i.e. scrolling to the bottom of
terminal output) when pressing modifier keys in isolation or when
copying text using the shortcut Ctrl+Shift+C.
Fixes error that would sometimes occur when closing the Terminal after
calling write() but before the VisualServer had finished drawing the
current frame.
Makes for pretty paths when extending scripts:
`extends "res://addons/godot_xterm/terminal.gd"`
vs.
`extends "res://addons/godot_xterm/nodes/terminal/terminal.gd"`
Currently "res://addons/godot_xterm/pty.gd" is acutally `pty_unix.gd`.
This is okay for now as the PTY node is only supported on Unix
platforms. However, we will need to sort it out when adding Windows
support as part of #25.
Also remove the GDXterm namespace.
Most notably:
- Reflow is now working. Terminal size will fill the window and
cols/rows will be resized/calculated based on window and font size.
- Added support for different fonts (i.e. bold, italic, bolditalic).
- Enabled blinking characters.
- Adde more tests and caught a few subtle bugs.
- Removed renderer code (which was part of xterm.js) and just
doing naive rendering in terminal.gd, but it seems to perform
a lot faster.
Still not working completely:
- vim (some weirdness going on).
- vttest (more weirdness).
Todo:
- Fix the above.
- Draw the cursor!
- Improve performance. Performance is still not great. The terminal
becomes unusable when running `yes` or `cmatrix -r`.
