WebUI updates & small fixes

[mcspr]

• use jquery slim, update to the latest 3.4.1
• update wheelcolorpicker to 3.0.8
• remove jquery ajax, call fetch for ws and xhr for upgrade
• tryng to be clever with colorpicker value conversions
• fix ir module using lightColor with 4 bytes, just use lightBrightness instead
• revert getFreeHeap overhead
• schedule lights provider on loop instead of running in sys
• fix crash with garp when AP is destroyed

0bf07f1 change:

 code/espurna/data/index.all.html.gz        | Bin 64845 -> 59323 bytes
 code/espurna/data/index.light.html.gz      | Bin 61366 -> 55886 bytes
 code/espurna/data/index.lightfox.html.gz   | Bin 52485 -> 46869 bytes
 code/espurna/data/index.rfbridge.html.gz   | Bin 53505 -> 47854 bytes
 code/espurna/data/index.rfm69.html.gz      | Bin 82956 -> 77308 bytes
 code/espurna/data/index.sensor.html.gz     | Bin 54625 -> 48969 bytes
 code/espurna/data/index.small.html.gz      | Bin 52485 -> 46869 bytes
 code/espurna/data/index.thermostat.html.gz | Bin 53268 -> 47624 bytes
 8 files changed, 0 insertions(+), 0 deletions(-)

[tonilopezmr]

Well played 👏