Optimizations for Chromium browser and better timestamps handling

and fixes and improvements

Python >= 3.10 & fixes / improvements

Changes related to Python >= v3.10 deprecation in SSL module
Improvements in the processing of http messages
Fixes in the tiles buffer
Improvements in the handling of map

Implementation of a geotagged videos viewer feature

in addition to the geotagged photos viewer feature
preview panel of media
waypoint display in editor mode
speed optimizations (gpx files loading about 20% faster)

Optimizations for Chromium browser

and improvements in namespace management for track merging

Implementation of geotagged photos viewer

Implementation of geotagged photos viewer

Implementation of points filter

to eliminate little jags

Speed optimization of tiles cache

Far faster cache as it grows
UI improvements, auto-scroll control

Improvement of elevation / altitude gain calculation

Improvement of filtering
Speed optimizations
Better reactivity in 3d viewers while map is loading
UI improvements

Speed optimization of gpx loading and saving

Speed of loading and of saving up to x 3 thanks to custom expat xml builder and dom, and several tweaks
Bug fixes
Better compliance with gpx schema (fields order)

Allow control of 3d view margins around track

and various fixes and improvements