Extend the command MASK/LINE

now the command MASK/LINE accepts the following arguments:

WIDTH, ANGLE, X, Y

requested and suggested by Robert

re #7503
Extend SANS interface to display MASK/LINE option

re #7503
Add space to accommodate the LINE entry

small changes on SANSRunWindow.ui to adapt to the LINE showing more 2
parameters.

re #7503
Merge branch 'feature/7503_support_line_angle' into develop