Move cite:post (#24)

[moewew]

For #24

• Move cite:post into loop code so it is executed for every citation.

• Simplify the sabrackets name format, it should not be called with \ifciteseen true anyway. In particular sabrackets is called only if \cbx@apa@ifnamesaved is false, but then \ifciteseen must also be false. Hence the \ifciteseen in sabrackets is superfluous.

[moewew]

cite:post (which currently only takes care of biblatex-apa's own name tracker) is also called in some macros where it might not make sense.

• cite:post is called in \fullcite and \fullcitebib: These macros could be regarded as outside the "citation flow" and it could be argued that they should not be tracked.
• The starred cite versions \cite* and friends also call cite:post, but here biblatex-apa has not typeset the author name itself and thus has no control over the format. (That might be acceptable since the user asked for manual control and \cite* still should be a full citation as far as everything else is concerned.)

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I did not include the more radical redefinitions I had in mind in my last post in #24 yet. I'll have a look at that later and if I think it can be useful will submit another pull request with that.