Import series: add support for extracting catalog numbers

[php-coder]

Examples:
SC# 620-22
Sc 1395-1403
M# 726-729
Mi 1655-1663
Mi# 2646-49
Mi# Bl 235
M# Block 213
Mi. 1519-22
Заг № 938-946

Tech debt for 29f6dc9 (#660)

[php-coder]

After fixing #769 and #770 we also should support Zagorski and Solovyov catalogs.

[php-coder]

Support for Michel numbers will be added. All other catalogs will be addressed in the separate issues.

M# 726-729
Mi 1655-1663
Mi# 2646-49
Mi# Bl 235
M# Block 213
Mi. 1519-22

The first, very naive implementation only supports numbers in a form #726-729.

[0pdd]

@php-coder 16 puzzles #902, #903, #904, #905, #906, #907, #908, #909, #910, #911, #912, #913, #914, #915, #916, #917 are still not solved.

[0pdd]

@php-coder 15 puzzles #902, #904, #905, #906, #907, #908, #909, #910, #911, #912, #913, #914, #915, #916, #917 are still not solved; solved: #903.