Added Graps Panel + Tabs

1) 'Charts.html' file created;
2) 'Control meeting' panel addet to 'Charts' panel. Switching between panels is available using 'Boostrap Togglable Tabs';
3) 'Google Charts' visualization added to 'Charts' panel;
4) JS scripts from 'Control meeting' and 'Charts' panels mooved to 'ChartsScripts.js';
Added 'Charts' panel + Tabs

1) 'Charts.html' and 'PanelScripts.js' created;
2) 'Control meeting' added to 'Charts' panel. Switching between panels is avaliable using Bootstrap Togglable Tabs;
3) JS scripts from 'ControlMeeting.html' and 'Charts.html' files moved to 'PanelScripts.js';
4) Google Chart visualization added to 'Charts' panel;