Two new items for SysInfo plugin

[jsmorley]

Added two new measurements for SysInfoType to the SysInfo plugin:

LAST_SLEEP_TIME : [Number] A timestamp number (number of seconds since January 1, 1601) reflecting the date and time Windows last entered a sleep state. Use with a Time measure to get a formatted string of the date/time, or subtract from the current time and use with an Uptime measure to get a formatted string of the elapsed time.

LAST_WAKE_TIME : [Number] A timestamp number (number of seconds since January 1, 1601) reflecting the date and time Windows was last returned from a sleep state. Use with a Time measure to get a formatted string of the date/time, or subtract from the current time and use with an Uptime measure to get a formatted string of the elapsed time.

https://docs.rainmeter.net/manual-beta/plugins/sysinfo/#SysInfoType