scripts: apply-renames: Update default clang version to 18

clang 18.1.8 is currently installed in the OpenBMC CI container.
Changing the default saves having to explicitly invoke `scripts/
apply-ren

scripts: apply-renames: Update default clang version to 18

clang 18.1.8 is currently installed in the OpenBMC CI container.
Changing the default saves having to explicitly invoke `scripts/
apply-renames` with `CLANG_VERSION=18`.

Change-Id: I2f0ff5baf485a34089dc663cb5870efa36f3c3c6
Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>

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scripts: Add apply-renames based on clang-rename

It turns out coccinelle is not so great at parsing C++. At the moment
the transformations we're interested in are renames, so let's at least
leverage

scripts: Add apply-renames based on clang-rename

It turns out coccinelle is not so great at parsing C++. At the moment
the transformations we're interested in are renames, so let's at least
leverage something that can parse C++ for them.

scripts/apply-renames tries to automate the invocation of clang-rename
in a way that avoids most of the foot-guns.

Change-Id: I2f69a8301010f0f00f5fa0337b7921498ae125f9
Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>

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