EXT-7142 FIXED Upload functionality duplicated in the Build menu and Select Linked Parts menu moved up

- LLPanelMainInventory::setUploadCostIfNeeded() - uncommented the line which enables retrieving of the upload cost price using LLGlobalEconomy class.
- Implemented LLUploadCostCalculator event handler in the llviewermenu.cpp (the fact that it should be implemented in this file was discussed with Mike Antipov).
- LLUploadCostCalculator::calculateCost() is implemented only for code readability: it's name is more descriptive than a code snippet placed directly in the constructor (LLPanelMainInventory::setUploadCostIfNeeded() works in similar way: it calculates cost_str only once).
- 'Select Linked Parts' menu was moved below 'Edit Linked Parts'.
- 'Upload' menu was added at the bottom, below 'Options' menu

Reviewed by Mike Antipov at https://codereview.productengine.com/secondlife/r/425/

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branch : product-engine

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