Removed files and consolidated functions

Removed options menu, reworking terminal file.
Emails no longer highlighted.
Searching no longer supported.
Removed options that were useless.
Removed menu files, working on settings init.
Still working on reorganizing terminal.c

Seg fault when opening a window 3-levels down.
Working state - terminal.c cleaned up.
Removed dialog.c and delete-event handling.
Removed more from callbacks, moved to terminal.c
Renamed command and execute opts. Updated manpage.
Investigating resize method.
Added bash completion file
Re-added fullscreen key.

Not all window managers provide an easy way to
toggle the fullscreen state of windows. For this reason,
the fullscreen key was added again.
Re-added fullscreen to manpage
Removed callback and main files.

Working towards a single source-file application.
Working on resize method
Using single source file.

axon.c is the only source file.
Fixed type in manpage
Using new config loading scheme.

Try to load $XDG_CONFIG_HOME/axon/axonrc,
then $HOME/.config/axon/axonrc.
No changes are made to config file and defaults
are loaded if an option is not present or there is an error.
Formatting
Updated FILES section
Reworked config file loading.

Default config is
$XDG_CONFIG_HOME/axon/axonrc
and backup is
$HOME/.axonrc
Resize method redone.