update ImGuiKnobs to newer Version

[lokkiikkol]

Hi,

I am using DPF-Widgets with the PlugData (0.9.2, MacOs) export option for lv2/vst3 plugins and i am creating custom GUIs from the generated template.

It works quite nicely, but I am missing the knobs flag ImGuiKnobFlags_AlwaysClamp in the dpf-widgets. Other flags seem to work just fine, so I guess this one has been added later and this repo was not updated. Could this be done? The flag is quite essential since when entering an out of bound value in the textbox below the knob the whole knobGUI "breaks",drawing either more then full turns, or totally broken lines with knobs looking like long pipes (at least with the ImGuiKnobVariant_WiperOnly I used)

[hauru]

Bump. There's also no support for logarithmic scaling in the included version; later versions have a flag for this.