add grey boost icons, generate css for boost shop

#150

add boost icon in grey versions (60% lightness seemed to match other
grey icons)

add addCSSRule function for dynamic css generation ability

add generation of boost shop icon css rules
Update boosts.js

Flipside fix
Merge pull request #562 from LucidCrux/icons_in_shop

Grey Boost Shop icons, dynamic css rule creation
Merge pull request #563 from mart0258/patch-1

Update boosts.js
changelog, idle tracking
no more manual icon css (almost)

add code to generate css rules for boosts and badges, should only need
to manually add rules in special cases
add icon images batch 1
add icon attributes to batch 1
typo fixes
fix file names
untag glass extruder and sand purifier when inf

untag glass extruder and sand purifier when sand use is divided by infinity
Safety Net and Safety Blanket

Issue #543
Another new Boost

And a wording change to Safety Net
The rest of the new boost and issue #577
Discovery and monument counts in stats`

Reddit request
icon images batch 2
Reduce Mario Spam

Partial solution - some still remains #532
Merge pull request #572 from Unponderable/patch-1

untag glass extruder and sand purifier when max
Merge pull request #575 from waveney/wav20

Safety Net and Safety Blanket
Merge remote-tracking branch 'origin/ed-isnotawebdesigner'