Add features to facilitate checking and changing config files

[shepherdpp]

Adding functions to access the config file qteasy.cfg, provide means of loading, writing and overwriting parameters into the file qteasy.cfg annonimously

[shepherdpp]

fixed a bug and error checks for manual buy and sell order commands

[shepherdpp]

all functions updated:

• Added new features: now qteasy has multiple functions to access and modify start up setting file:
  • Added new function qt.start_up_settings(), to access and print contents of start up settings file
  • Added new function qt.update_start_up_setting(), to modify start up settings file
  • Added new function qt.remove_start_up_setting(), to remove settings from the file
• Fixed bugs in trader TUI buy and sell orders, added error handling for wrong inputs

waiting for test result