Fix #5: Handle overlapping sections

Closes #5

See merge request allzp/zipr!8

Handle overlapping sections properly. This
was a problem with calculation of the gap
between two sections that happen to overlap.
It resulted in a negative gap that turned
into a very large positive number.

Gitlabrunner

See merge request allzp/zipr!7

This will build zipr and check that it compiles.

Turn off warnings as errors for deprecated
features. Leaving these warnings as errors
breaks the build with newer versions of GCC.

Add padding sections.

See merge request allzp/zipr!6

Add padding sections to a zipr'd program where
the gap between two existing sections is greater
than a certain minimum boundary.

Make a global PAGE_SIZE definition.

See merge request allzp/zipr!4

Fix typo in ElfWriter::DetectMaxAddr

See merge request allzp/zipr!2

Resolve "unpinned ibts result in pins"

Closes #3

See merge request allzp/zipr!1

Removed bea engine from lots of inclue places and link steps, changed verbose mode for zipr to false, added very-verbose mode for zipr.  fixed a few zipr bugs related to non-existant fallthroughs, etc.