v0.5.2 - Friendlier Timer/Counter functions

I kept getting push-back about the 'Tms' IEC TIME style unit names. So why fight it? All the following forms are now allowed:

Argument	Aliases	Unit
"ms"	"milliseconds", "msec"	Milliseconds (default)
"sec"	"s", "seconds"	Seconds
"min"	"m", "minutes"	Minutes
"hour"	"h", "hr", "hours"	Hours
"day"	"d", "days"	Days

Also accepted: Tms/Ts/Tm/Th/Td — great for tag names (FillTimeTm stays short, and Tm sidesteps the minute-vs-minimum ambiguity of Min).

Also loosened things up and allow positional for the arguments in on_delay, off_delay, count_up/down, which really cleans things up:

Before:
on_delay(MyTimer, preset=500, unit="Tms")
After:
on_delay(MyTimer, 500)

Full Changelog: v0.5.1...v0.5.2