Grepros

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* add forgotten implementation for --every-nth-match
* fix --every-nth-message
* fix error on grepping bags where no topic or type name matches given filter

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* fix forcing all numeric array fields to integer lists regardless of type
* fix error on subscribing to defunct topic

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* add support for reading zstd-compressed bagfiles
* use message type definition from ROS1 live topics instead of locally installed package
* optimize partial printing of very long array fields
* optimize CSV output of very long array fields
* strip leading "./" from printed filename prefix if grepping working directory
* fix not skipping ROS2 bag if all topics filtered out
* fix making compatible QoS for ROS2 topic subscriptions
* fix making unique filename on error in HTML output

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* continue subscribing to other live topics even if one causes error
* continue reading from ROS2 bag even if one message type causes error
* subscribe to live topics in ROS2 with QoS matching publisher
* fix not saving publisher QoS profiles in written ROS2 bags
* fix package build not including submodules (1)

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* add overwrite=true|false to --write options
* add column-name=rostype:value to --write Parquet options
* add scripts/generate_msgs.py
* create message type definition from .idl if .msg file not available in ROS2
* improve DDS type parsing in ROS2
* handle ROS2 char and byte int8/uint8 reversal vs ROS1
* fix assembling message type full definition in ROS2
* fix processing byte values in ROS2
* fix processing bounded string types in ROS2
* fix inserting chars in Postgres
* fix inserting very large integers in SQLite

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* refactor database and SQL sinks onto a common base
* allow specifying dialect options in Postgres/SQLite output
* allow overriding table and view names in SQL dialects
* allow specifying field value adapters in SQL dialects
* allow specifying structured type mappings in Parquet output like type-uint8[]="list(uint8())"
* drop meta-table from Postgres output
* drop default value from --publish-prefix option
* fix error in parsing subtypes from message definitions
* fix converting ROS2 temporal messages to seconds/nanoseconds