v1.5.0-beta.1: Jinja2-style template filters

Pre-release v1.5.0-beta.1

Added

• Jinja2-style template filters for text_template: The text_template field now supports
  a filter pipeline using {{ variable | filter }} syntax, compatible with common Jinja2 filters

Variables:

• state - entity state (respects decimals config)
• name - entity friendly name
• attributes.<attr> - any entity attribute (e.g. attributes.unit_of_measurement)

Filters:

• upper - convert to uppercase
• lower - convert to lowercase
• title - title case
• round(n) - round to n decimal places
• int - convert to integer
• float - convert to float
• replace('a', 'b') - string replacement
• truncate(n) - truncate to n characters
• default('value') - fallback if value is empty

Examples:

text_template: "Charging:\n {{ state | upper }}"
text_template: "{{ state | round(1) }} {{ attributes.unit_of_measurement }}"
text_template: "{{ state | replace('_', ' ') | title }}"
text_template: "{{ state | upper | truncate(8) }}"

Filters can be chained. Fully backward compatible with existing {{ state }} and {{ name }} templates.

See the updated README for full documentation.

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NOTE: This is a pre-release for testing. Please report any issues before the stable release.