Simple dynamic memory management for the LPC
Update gitignores
Fix handling of buffer swap if backbuffer already has data
Extend font library to return next character

This allows chaining of font drawing commands for buffers which contain
multiple NUL-separated strings.
Add a NAK-code for out of memory
Fix calculation of text width
Implement table column alignment
Add missing file: library for messages to lpc
Add function to draw table row from one buffer