Loi addition deletion

See merge request Nicolas.Boeckh/la_app_xos!11

Added:
- LOI form addition fix
- LOI deletion

Added data points

See merge request Nicolas.Boeckh/la_app_xos!10

Ux context aware and last prefs

See merge request Nicolas.Boeckh/la_app_xos!9

Added:
- GPS Usage pref
- Data footer Widget

Modified:
- PositionHandler is now pref dependent.

Added:
- GPS Header widget

Modified:
- Database header widget no longer uses vignette (height difference with rest of header
- Code now in line with `pedantic` library linter rules except :
```
    unnecessary_this: false
    omit_local_variable_types: false
```

Added :
- Map -> Observer to trigger redraw
- Dedicated map widget

Fixed:
- Consistent zoom level through redraw
- PM marker does not need refresh to redraw (... map not stateful lol)

Added:
- Slight doc

Modified:
- Various to `Theme.of(context)` to have constant themes, need to make screen size dependent.
- Initial dialog to not out of bounds
- Map pane to flex to/from
- Moved HomeController in hierarchy, now stays active through state changes.

Ux upgrades

See merge request Nicolas.Boeckh/la_app_xos!8

Added :
- Tristate toggle
- Entry dialog
- Various docs
- Entry pref

Modified :
- Bluetooth dialog
- DataHandler (only an in between now, fetch ops now on DB),
- Various docs
- decorations
- helpers

Removed :
- BT Unavailable (dialog based)

Removed:
- Battery Visualizer -> Too much real estate taken, not so useful, device battery visible in main header and overview panel.
- Dash Separator -> Useless
- Growing text -> Relic from early testing days
- Header -> Replaced by `main_header` and `main_footer`.

Added:
- Documentation
- Main header components (battery and db, WIP: map and network)
- Main footer
- Locations of interest database (and related data classes).

Changed:
- DataHandler (WIP, remove reliance on latest packet, use database)
- Renamed DatabaseHandler to MainDatabaseHandler (only storing LogAir device data).
- Tweaks in overview widgets to remove tree clutter.

Added:
- Overview Widgets documentation
- `NetworkHandler` new features documentation.
- `Graph` documetation.

Modified:
- Generalized overview widget elements construction.

Fixed:
- Unknown references in docs
- `DataHandler` pop function removed regardless of whether data was pulled from DH or DB (TODO transition to full db mode).
- Moved battery level to icon function to utils because future use in `MainHeader` as well.

Added:
- Main header
- Device class

Fixed:
- Share disabling on prefs reset
- Selection dialog state wonkyness

Preferences integration

See merge request Nicolas.Boeckh/la_app_xos!7

Added :
- Network Mobile network && Preferences check
- General share check
- Bluetooth S_UUID and C_UUID to preferences
- Preferences for Location Accuracy (need integration and observable)
- Overview widgets and generic decoration
- Finished preferences menu

Added:
- Separated tiles in preferences to independant files
- Overview tiles
- Overview action buttons

Fixed:
- PreferenceKeys not retrieving correct element
- Regex preference validation
- ExpansionTile object tree removal of hidden objects

Changed:
- Reorganized File structure for preferences and overview

Added :
- General Prefs: "Share data with LogAir servers"

Tweaked :
- PM tile with no data does not show "N/A" but is greyed out.
- Dividers are full lines with lr indents.

- Added Dashed line for UX
- Beautify Settings form
- Prefs to const system

- Fixed : Navbar x Carousel sync
- Added Documentation

- Graph : Added Axis Titles
- NavBar : Migrated to "cicular_bottom_navigation"
- Battery Indicator : Rounded corners + Color lerping
- Data Tile :  resized text

Ui data pane

See merge request Nicolas.Boeckh/la_app_xos!4

UX/UI:
- Tweaked data tile (rounded corners)
- Tweaked settings layout (ListTile usage)

Fixes:
- Map display controller (null guard)

TODO: Make data pane only scrollable for data tiles.

- Data Handler : Removed deprecated calls
- DB Handler : Removed duplicate deletion.
- Data Packet : Corrected inversion of Humidity / Pressure (oops)
- Graph : Padded time values in graph x-axis
- Settings : Added Storage deletion button, linked to DB.

# Conflicts:
#	.flutter-plugins-dependencies
#	lib/ui/data_widget.dart
#	lib/utils/pm_symbol.dart