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### Problem description
<!-- Describe the bug that you fixed/feature request that you
implemented, or link to an existing issue describing it -->
### Implementation description
<!-- Explain what you did to correct the problem -->
### Screenshots
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### Additional things
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This pr aims at fixing for negative values in advanced search for
numerical values. For a simple example try searching for -1 for int32_t
which is 0xFFFFFFFF. With the changes you can now find -1 for 1,2,4 or 8
byte integers.
Internal types are bigger than or equal to the types selected in the
options. Search keys are converted to the bigger type, but the values
read from the input file are not. This works ok for positive numbers,
but for negatives it needs some casting.
The casting is performed inside a newly added function that takes the
value returned by read, the size in bytes of the selected type in the
options and a template argument for the 64 bit type the value is stored
into.
I have tested positive and negative values for several different sizes
of signed integers. Also tested unsigned integers both in the low range
(near lowest limit) and in the high range (near largest possible value
for that type)
### Problem description
The default result export functionality of the Find tool is limited to
only exporting data in a nonstandard text format. This PR adds support
for exporting the results in CSV, TSV or JSON format. The PR also
removes the old format.
### Implementation description
I added the classes `ExportFormatter`, `ExportFormatterCsv`,
`ExportFormatterTsv` and `ExportFormatterJson`, with similar
implementations to the pattern data exporters.
~~I also moved the `ViewFind::Occurrence` class into
`hex/helpers/types.hh`, so the exporters can access it.~~
### Screenshots
### Additional things
Another small change I made is moving the "{} entries found" line on the
same line as the Search and Reset buttons. I think it looks cleaner this
way, but if anyone disagrees, I can revert it.
---------
Co-authored-by: WerWolv <werwolv98@gmail.com>
