Changes to use God mode more often.

Changed <escape> to toggle god-mode in all buffers, and made Emacs boot
in God mode. Within God mode "i" still toggles god-mode locally.
Change the cursor style to indicate God mode.

Taking Chris Done's suggestion (and code) for changing the cursor style
based on whether God mode is enabled or not.
Make mu4e-compose God-exempt.

I was looking through Chris Done's personal configuration of God Mode,
and he had added message-mode to the god-exempt-major-modes list.

https://github.com/chrisdone/chrisdone-emacs/blob/master/config/god.el

I don't want to use God mode when I'm writing an email, either, but I
use mu4e, which uses its own variation of message-mode.
Modified org-agenda-files in custom.el.

Changed the location of an org-file.
Use org-mode elsewhere.

Orgstruct-mode is a minor mode with some basic Org functionality. I want
it to be used in mu4e-compose-mode, and text-mode.

I also want tiddler files (TiddlyWiki) to default to using
text-mode (and, in turn, orgstruct-mode) rather than Org Mode.