Enhance hlines and alines

Hi Daniel,

first of all great compliments in advance. I'm always excited about what you bring in every release with this library for extensions.

Step by step I add each new function to the charts. Latest improvments are RSI in the middle, hlines and alines.
Currently I build up the alines and hlines as follows:

        hlines = {}
        hlines['values'] = swings_1
        hlines['colors'] = ['lightgrey' for x in range(len(swings_1))]
        hlines['linewidths'] = [1 for x in range(len(swings_1))]

        hlines['values'] += swings_2
        hlines['colors'] += ['grey' for x in range(len(swings_2))]
        hlines['linewidths'] += [1 for x in range(len(swings_2))]

            alines = list(zip(zip(df_breakout.d4_start, df_breakout.d4_high), zip(df_breakout.d4_end, df_breakout.d4_high)))
            alines += list(zip(zip(df_breakout.d4_start, df_breakout.d4_low), zip(df_breakout.d4_end, df_breakout.d4_low)))

mpf.plot(df,
                 type='candle',
                 volume=True,
                 volume_panel = 2,
                 addplot=add_plots,
                 title=myfilename ,
                 ylabel='Kurs',
                 ylabel_lower='Volumen',
                 style=s,
                 figscale=3.0,
                 figratio=(18, 10),
                 datetime_format = '%d.%m.%y',
                 xrotation = 20,
                 hlines=
                    dict(hlines=hlines['values'], colors=hlines['colors'], linestyle='dashed', linewidths=hlines['linewidths']),
                 alines= alines,
                 savefig=save,
                 tight_layout=True,
                 closefig=True)

If i would like to use different colors and sizes, would it be possible to add a list of dicts in the future? Something like ...
hlines = [dict_support_lines, dict_resistence_lines]
... so that the other parameters (eg. linestyle) can also be changed more easily?

Beginne damit, die aktuelle Verarbeitung von hlines und alines in der mplfinance plotting API nachzuverfolgen, und prüfe alle vorhandenen Beispiele oder Tests für diese Optionen. Definiere die unterstützten gruppierten Stil-Dictionaries und bestätige, dass Farben, linewidths und andere Linienparameter je nach Gruppe variieren können, während bestehende Eingabeformen weiterhin funktionieren.