State based drawing

[kr12]

now to draw another object with same properties we need ctr-C, A, draw points, ctrl-shift-V. If we need to remain not all tags this will be much more clicks.
Review another usercase - buildings_tools plugin: it draws rect with tag building=yes :) Also it may be 65535 plugins that will draw reserviors, parkings, tennis and socker courts, itc.
And another - drawing power line:

• A) copy points with tag tower, join with line, tag powerline, DO for all lines or for dinner time..
• B) draw lines, ctrl-shift-V tags of powerline, search in forums and find some search expression to find all points on newly created lines.... Potlatch most of users will never deal with this.

With implementing "state of drawing" form (grid) user will set tags in it and all drawing tools (that create new geometry) will fill points and links with appropriate tags for points and junctions. Incremental counters and other user "eval" functions also will be easy available.
The "state of drawing" form will have switch UI element (combobox) that set behavior of this form:

• standalone (independent)
• property picker - form automaticly get tags of selected object