db: timestamp is included in schema already

fixes issue where migration fails because column already exists
db: moving to common.sql
Merge branch 'dbinstall'
refactor: move to function
Allowing python string formatting of text.
Dynamically update slide variables.
update changelog
Adding link to update-page.
Update help text.
URL is shown in text below.
decode escaped characters
move update to assembler
Merge branch 'dynamic'