Add capture and counter modes support

[syfre]

Fix : Crash when the ISR handler is not attached (for example, if a timer is used to trigger the ADC, no ISR handler is required) Add : Support output signals TIOA,TIOB in Wave mode, set time ON / duty cycle of an output (for example, to use a timer as a signal generator) Add : Support for capture mode on TIOA input signal Add : Support for counter mode on TCLK input signal

[iddq]

how could I change the freq while the timer is still running?