compose: add more characters
compose: add more characters

Add more characters, most important a-z, A-Z and German letters. Also
avoid using - and = in input keys, as they are default page chage
hotkeys.

Signed-off-by: 袁野 <fb2ca48bc7216354c261d95b3197b52f5a54fd4c@gmail.com>

kaio/ibus-table,j717273419/ibus-table,acevery/ibus-table,acevery/ibus-table,kaio/ibus-table,mike-fabian/ibus-table,mike-fabian/ibus-table,j717273419/ibus-table