Cleaned Picam implementation

[adriente]

Summary

1. DAQ_2D_Viewer for cameras that run with the Picam.dll
2. Updated pyproject.toml
3. Updated readme.rst

Modified files

• readme.rst
• pyproject.toml
• /src/pymodaq_plugins_princeton_instruments/daq_viewer_plugins/plugins_2D/daq_2Dviewer_Picam.py
• /src/pymodaq_plugins_princeton_instruments/hardware/picam.py
• /src/pymodaq_plugins_princeton_instruments/hardware/picam_config.py
• /src/pymodaq_plugins_princeton_instruments/resources/config_princeton.toml

TODO : Better implementation of the Fergie.

[seb5g]

the file in resources should be called config_template. This is where a developer adds the required config entries he needs. Then at runtime, a copy of it will be done in .pymodaq folders and used. The file copied at runtime will be called "config_princeton_instruments" (from pymodaq_plugins_princeton_instruments)

[seb5g]

but it means that the Config object in the utils modules should specify to use this template. By default, it expect a file called "config_template"