added more tests to increase test coverage

Pass TEXINPUTS env var to child processes

Scheduler: Implement BlockSignals helper class

Utils/Logger: /sys/log/self command and more command documentation
Scheduler: Add usingHiresTimers() to query current timer source

Utils/Logger: Quote filename for console directory in FileTarget
Utils/Logger: Add directory node return value to syslog-target and udp-target console commands

Utils/Console: Implement directory return value support in Executor
Utils/Logger: Make file-target return the new directory node

Packets: Allow generic assignment of whole packets

Utils/Logger: Implement dynmaic targets

Utils/Logger: Add more formatting options to SyslogUDPTarget

Utils/Console: Fix rename Target::clear() to Target::flush() to fix name clash (Target / StringTarget)

Scheduler: Switch default timer source to lores / epoll()