Rename the package from p3 to p3analysis

[Pennycook]

"p3" is already the name of an existing Python package. "p3analysis" was chosen as our replacement name because it is descriptive, and allows for future p3-related packages to follow a similar naming convention.

Related issues

Closes #48.

Proposed changes

• Replace all instances of "p3" with "p3analysis".

---

I ran the tests and built the documentation locally, and would appreciate it if reviewers could do the same. Most of these changes were made with mv and/or sed. It looks like git lost track of some of the files as renames depending on how much they changed.

[laserkelvin]

Generally seems good to me; I chalked up a Dockerfile and was able to run stuff without issues:

FROM ghcr.io/astral-sh/uv:0.4.8-python3.12-bookworm

RUN apt-get update -y && apt-get upgrade -y && apt-get install git make
RUN git clone https://github.com/Pennycook/p3-analysis-library.git /opt/p3-analysis-library
WORKDIR /opt/p3-analysis-library
RUN git fetch -a && git checkout package-rename
RUN uv pip install --system -e .
RUN python3 -m unittest discover -s tests
# run some example scripts too
RUN python3 examples/navchart/plot_simple_navchart.py
# try build docs
WORKDIR docs
RUN uv pip install --system sphinx sphinx_gallery furo
RUN make html

As a related thing, pyproject.toml is missing the furo theme dependency under dev!