Implements #25177.

Changes the current behavior of the "version" parameter by moving away
from string prefix matching to actually parsing provided (partial)
versions. As a result, for example, "version=0.3.2.1" doesn't
magically include versions 0.3.2.10 to 0.3.2.19, 0.3.2.100 to
0.3.2.199, etc. anymore. Without this change, version ranges would
have become just too confusing. The downside is that this change
requires a major version bump.

Implements #6947.

If the first thing we'd learn from a bridge was an extra-info
descriptor, we would not have stored the contained transports. This
case is very unlikely and has very little effect. Worth fixing anyway.
Found via code analysis.

Note that the previous code was not wrong. It declared a local
variable and it read a line (containing headers). But these are two
distinct things, and doing them on one line confused the code
analyzer. Splitting them is just fine.

Turns out that characters inside square brackets don't need to be
escaped. In fact, "^[0-9\\.]{7,15}$" does not only match valid IPv4
addresses but also strings like "1\2\3\4".

This interface only ever provided two of the many fields in details
documents.

Fixes: #27180

 * AS0 is an allowed value. This is used for unknown AS numbers.
 * Leading zeros are stripped from the AS number.
 * If an AS number is larger than the maximum possible (in 32-bits)
   then this will be treated as an error.
 * Tests are increased to cover additional cases.

Fixes: #27163