add progress bar to status bar

It can be used to display progress during program upload.
To use it call ShowPLCProgress (like ShowPLCProgress("transfered",
10)) in your PLCObject implementation.

.project

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^tests/.*/build$
^.idea/.*
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^.*\.pyc$
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^.*~$
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^.*\.swp$

bug_report.*\.txt
i18n/.*.new$
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