Factor out CSS

This makes no changes, except minor refactoring.
Adjust margins

Moves the dates on plot one line down
Keeps the margins their default value - Fixes issue #1
Remove Georgia font
Factor out parser for time format
Factor out reactive function which gets files
Fix margin cutoff
Use system default font
Moving average filter responds to a checkbox
Switch to actionButton
Working for line, scatter WIP
Switch to actionButton, and validate columns
Fix loading issue on scatter plot
Add validation message for scatter
Merge, for no aparent reason
Get rid of hidden selectInput, and introduce a whole bunch of errors in the process
Minor refactor
Less code, lot more errors
Some cleanup
More cleanup
Remove completely unnecessary mutations