System wide key remapping

When editing text or code it is quite often very useful to jump to the beginning or the end of a line, or to move the cursor one page up or down..
Unfortunately the keys dedicated to this task (home/end/pageup/pagedown on a windows-pc) have got a different meaning on a mac: Page up/down scroll one page up/down – without moving the caret (cursor), home/end move to the beginning/end of a document – also without moving the insertion point.

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