Delete most of the dictionary installers and replace them with a shell script

...sub/packages/win_installer/build_dictionary_installers.sh

aegisub/packages/win_installer/dictionaries/ca_ES.iss

aegisub/packages/win_installer/dictionaries/cs_CZ.iss

aegisub/packages/win_installer/dictionaries/da_DK.iss

aegisub/packages/win_installer/dictionaries/de_AT.iss

aegisub/packages/win_installer/dictionaries/de_DE.iss

aegisub/packages/win_installer/dictionaries/el_GR.iss

aegisub/packages/win_installer/dictionaries/en_GB.iss

aegisub/packages/win_installer/dictionaries/en_US.iss

aegisub/packages/win_installer/dictionaries/es_ES.iss

aegisub/packages/win_installer/dictionaries/eu.iss

aegisub/packages/win_installer/dictionaries/fr_FR.iss

...packages/win_installer/dictionaries/fragment_dictbase.iss

.../packages/win_installer/dictionaries/fragment_stddict.iss

aegisub/packages/win_installer/dictionaries/it_IT.iss

aegisub/packages/win_installer/dictionaries/nl_NL.iss

aegisub/packages/win_installer/dictionaries/pl_PL.iss

aegisub/packages/win_installer/dictionaries/pt_BR.iss

aegisub/packages/win_installer/dictionaries/ru_RU.iss

aegisub/packages/win_installer/dictionaries/sk_SK.iss