btop: update to 1.3.0, cleanup portfile

[i0ntempest]

Description

Type(s)

• bugfix
• enhancement
• security fix

Tested on

macOS x.y
Xcode x.y / Command Line Tools x.y.z

Verification

Have you

• followed our Commit Message Guidelines?
• squashed and minimized your commits?
• checked that there aren't other open pull requests for the same change?
• referenced existing tickets on Trac with full URL?
• checked your Portfile with port lint --nitpick?
• tried existing tests with sudo port test?
• tried a full install with sudo port -vst install?
• tested basic functionality of all binary files?
• checked that the Portfile's most important variants haven't been broken?

[macportsbot]

Notifying maintainers:
@Samasaur1 for port btop.

[Samasaur1]

We should also be able to use Apple's clang bundled with Xcode 15, since despite reporting a clang version of Apple clang version 15.0.0 (clang-1500.1.0.2.5), it actually uses LLVM 16, which is the version necessary for btop. Unfortunately, the minimum versions of clang that MacPorts thinks is necessary for C++20 does not support ranges, the C++20 feature that btop needs, so we will need to maintain the list of blacklisted compilers.

[Samasaur1]

But that can be for a future improvement to the Portfile — once the epoch 1 change is made, this PR looks ready to merge in my opinion

[i0ntempest]

Epoch addition has been pushed