GUI Initial screen with easy access to FECGSYN functionalities

[fernandoandreotti]

This is up for discussion, we have four main functionalities to which we should facilitate the access. This could be done by creating an initial screen with 4 large buttons:

• Data Generation (call run_ecg_generator() with specified param - redirects to current version of GUI)
• FECG Extraction (call specific method, or FECGSYN_main_extract() to extract with multiple methods)
• FQRS Detection (call qrs_detect() with desired thresholds and refractory period)
• Morphological Analysis (call FECGSYN_benchMorph() to selected path and channels - assuming out struct as input)