Update cheatsheets

cppclean

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# cppclean
+
+> Find unused code in C++ projects.
+> More information: <https://github.com/myint/cppclean>.
+
+- Run in a project's directory:
+
+`cppclean {{path/to/project}}`
+
+- Run on a project where the headers are in the `inc1/` and `inc2/` directories:
+
+`cppclean {{path/to/project}} --include-path={{inc1}} --include-path={{inc2}}`
+
+- Run on a specific file `main.cpp`:
+
+`cppclean {{main.cpp}}`
+
+- Run on the current directory, excluding the "build" directory:
+
+`cppclean {{.}} --exclude={{build}}`