UI enhancements for datatable, header, etc.

[pournasserian]

• [x] in all datatables, action column should have min length zero
• [x] #1744
• [x] folders and files should be shown in one table (first folders, then files)
• [x] create/update folder should be done in modal
• [x] create/update file should be done in modal
• [x] #1743
• [x] add download button to file
• [x] add a row in datatable (first row) for linking to parent folder
• [x] develop new button components being used in page headers and action sections in datatables

[TheHadiAhmadi]

All of these tasks are done except 2 task which has dedicated issue