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That change was accidentially done during the SPDX conversion.

Fix errors and add fallthroughContext=AttrNormal for each context of diff.xml because all rules contain column=0

import Pure highlighting from https://github.com/jgm/skylighting/blob/master/skylighting-core/xml/pure.xml

this makes the unit test pass even for different languages set
beside this, it avoids that the highlighting that is chosen is dependent on the current locale
for the user

import Modula-3 highlighting from https://github.com/jgm/skylighting/blob/master/skylighting-core/xml/modula-3.xml

import LLVM highlighting from https://github.com/jgm/skylighting/blob/master/skylighting-core/xml/llvm.xml

e.g. KTextEditor stores one State per line, this avoids useless heap allocation
for unhighlighted files

- @<, @>, etc as Tag
- add @f$ and @f{
- ignore */ inside line comment
- fix code, verbatim, @f[, @msc, @dot:

```cpp
/// \code
int i; // out of context
```

Chicken is merged into Scheme

New:

- Datum comment: `#;...`
- Nested-comment: `#| ... |#`
- Flag extension: `#!...`
- Regex (Kawa): `#/.../`
- XML (Kawa): `#<...`
- String template (Kawa): `&{...}`
- Add some keywords and operators

Fix:

- Character literals (`#\...` and `\x...;`)
- Hexadecimal number (`#x...`)

Improvement:

- `, ', @ and # followed by ( now have the same color

- HlCFloat doesn't exists, only Float
- attributes char and char1 are now restricted to one character