…-dev and --exclude flags (#1256)

Hey!

This is to address issue #1249

Closes #1249

Looks like the `[tool.rye]` section in `pyproject.toml` is not created
properly if it was not already presented in the file.
This was due to the it not being created as a table.

Tested it like that:
- Have `pyproject.toml` without `[tool.rye]` table:
```
[project]
authors = [{ name = "xxx", email = "xxx@xxx.com" }]
name = "rye-test"
version = "0.1.0"
description = "wasm sample use py2wasm, rust, wasmer, gowasm, wasmedge"
readme = "README.md"
requires-python = ">=3.11.7"


[build-system]
requires = ["hatchling"]
build-backend = "hatchling.build"
```
- 
```
$ rye add --dev ipython
```
results in 
`pyproject.toml`
```
[project]
authors = [{ name = "xxx", email = "xxx@xxx.com" }]
name = "rye-test"
version = "0.1.0"
description = "wasm sample use py2wasm, rust, wasmer, gowasm, wasmedge"
readme = "README.md"
requires-python = ">=3.11.7"


[build-system]
requires = ["hatchling"]
build-backend = "hatchling.build"

[tool.rye]
dev-dependencies = [
    "ipython>=8.26.0",
]
```

Before fix it was:
`pyproject.toml`
```
tool = { rye = { dev-dependencies = [
    "ipython>=8.26.0",
] } }
[project]
authors = [{ name = "xxx", email = "xxx@xxx.com" }]
name = "rye-test"
version = "0.1.0"
description = "wasm sample use py2wasm, rust, wasmer, gowasm, wasmedge"
readme = "README.md"
requires-python = ">=3.11.7"


[build-system]
requires = ["hatchling"]
build-backend = "hatchling.build"

```

make uninstall_cmd available in Windows

Fixes #1136

## Summary

Closes #1012.

## Summary

This check can be subtly incorrect on case-insensitive filesystems
(e.g., NTFS). Seems easiest to just make the whole comparison
case-insensitive.

Closes #1284.

NITS: I fixed the license for readline in the documentation to GPLv3.

cf. https://tiswww.case.edu/php/chet/readline/rltop.html

> Readline is free software, distributed under the terms of the [GNU
General Public License, version
3](http://www.gnu.org/licenses/gpl.html).

cf.
https://gregoryszorc.com/docs/python-build-standalone/main/running.html#licensing

> Most licenses are fairly permissive. Notable exceptions to this are
GDBM and readline, which are both licensed under GPL Version 3.