If a true color has been set it will have code -1 regardless of the
actual color. Therefore, it shouldn't be stored in the color cache
dictionary otherwise all true color cells will be colored the most
recently set value.
Former-commit-id: 0d14fd1e47
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`.
With the exception of text_decoder.gd the code in these files follows
the original so closely that it doesn't qualify as an original work
and so there is nothing new to copyright.
Instead, the original license text is kept with a note mentioning the
port to GDScript.
