rigctl parsing space between commands

[mdblack98]

We can remove the parsing of the space between commands...unnecessary...
Rig command: f VFOA f VFOB f VFOA f VFOB
2021-05-24:12:19:13.766733: rigctl_parse: cmd==0x66
2021-05-24:12:19:13.778444: rig.c(2090):rig_get_freq return(0)
Frequency: 10136000
2021-05-24:12:19:13.779421: rigctl_parse.c(2018):rigctl_get_freq return(0)
2021-05-24:12:19:13.779421: rigctl_parse.c(1743):rigctl_parse return(0)
2021-05-24:12:19:13.779421: rigctl_parse.c(648):rigctl_parse entered

Rig command: 2021-05-24:12:19:13.780396: rigctl_parse: cmd==0x20
2021-05-24:12:19:13.780396: rigctl_parse.c(841):rigctl_parse return(0)
2021-05-24:12:19:13.780396: rigctl_parse.c(648):rigctl_parse entered

Rig command: 2021-05-24:12:19:13.781373: rigctl_parse: cmd==0x66

[mdblack98]

Stacking commands is broken on Unix
On Unix
Rig command: f f
Frequency: 145000000

    Rig command: 

On Windows
Rig command: f f
Frequency: 145000000

    Rig command:
    Rig command: Frequency: 145000000
    
    Rig command:

This is due to Unix use of the readline library which doesn't do this type of parsing to support this...investigating...