Fixes #1480: How to handle the increasing number of Lua constants
Re #1480: Cosmetics
Re #1480: added TELEM_MAX_ASPEED conversion in luaGetValueAndPush()
Re #1480: units updated
A little refactoring to avoid all the sprintf and too many string
comparaisons. Completely untested
Re #1480: wrong field.id for multiple fields
Re #1480: couple corrections of field names
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Merge pull request #1529 from opentx/projectkk2glider/lua_constants_issue_1480

Projectkk2glider/lua constants issue 1480
Fixes #1535
Change Lua field name from vario-speed to vertical-speed
Fixes #1534
Curve index is correctly resetted when its type is changed
SAFETY renamed to OVERRIDE
Fixes #1533
Fixes #1486
Fixes #1543
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Re #1486: gtest improvements in Lua section
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